Apparatus for forming concrete pipes



April 5, 1927.

A. HORTEN I APPARATUS FOR FORNING CONCRETE PIPES Filed Jan. 22. 1925 lalsfitomeys Patented Apr. 5, 192 7. UNlTED] ST Ari:

ALPHONS EOBTEN, 0F BERLIN-WILMERSDORF, GERMANY.

APPARATUS FOR FORMING CONCRETE PIPES.

Application flled lanuary 22, 1925, Serial No. 4,015, and in Germanyianuary 23, 1824. i

This invention relates in general to concrete pipes and to arrangements for producing such pipes. The object of the invention is to provide pipes which consist of cheap material and to provide apparatus that enables such pipes to be made in large quantities at very low costs for labor and power. A feature of the invention consists in a pipe made of concrete in which is embedded a cylindrical reticulated member which may consist of wire netting. Another feature of the invention consists in an arrangement for pension of the rotating the reticulated member on a contractible core while soft concrete is flung against it from without. The core is spaced from the reticulated wire member by spacing members which may be attached to the "interior of the reticulated member or wire netting, or to the exterior of the contractible cylindrical core.

The internal diameter of the concrete pipe is enlarged at one end and a ring-shaped internal groove is formed in the enlarged internal wall for the purpose of preventing packing, that is stuffed into the jointbetween two pipes, from being worked out in the course of time by the constriction and expipes caused by changes of temperature. A feature of the invention consists in forming the said'internal ringshaped groove by means of a contractible ring. V

A further feature of the invention consists of a concrete flmger comprising a cylindrical concrete contalner with a nozzle at its one end, a piston for driving the concrete through the nozzle and means for flinging the concrete from the nozzle against thorotating core covered with the reticulated concrete holder. .A further feature of the invention consists in means for moving the concrete flinger along thecore and reticulated member asit revolves. In accordance with the invention means are provided for removing the revoluble core with a concrete pipe cast thereon from the'concrete fiinger to a place where the pipe is allowed to dry. Thisremoving means consists of a trolley which travels on a rail or rails and has a coupling member journalled in it that can be attached and conveniently detached from a driving shaft. Further features of the invention will appear hereinafter.

The invention is illustrated in the drawing in which- Fig. 1 is a more or less diagrammatic elevation partly in section of the arrangement for producing concrete pipes.

Fig. 2 is a section on an enlarged scale of the trolley for removing a castpipe and of h the top end of the contractible core with the coupling device for coupling the latter to a vertical driving shaft.

Fig. 3 is a horizontal section through the core and a reticulated concrete holder. In this figure the spacing members for determining the gap between the-reticulated memher and the core and a segment of concrete 'pipe are in evidence. 1

Fig.

Fi 5 is a cross-section of a'contractible 7' or divisible ring for forming an internal ring-shaped groove and sleeve with an'enlarged diameter at one end of the concrete 1g. 6 is a top view of Fig 5.

Fi 7 is a section through a. joint between two 'hnished pipes, and

Fig. 8 is a sectional view of a modified means for throwing the concrete from the nozzle of the bontainer to the revolving core.

The illustrated apparatus for producing concrete pipes consists of parts rotated by a revolving vertical shaft 2 and of a concrete flinging apparatus adapted to be moved up and down on ayertical reciprocating rack 3. The revolving pipe holder consists of a vertical shaft or rod 4 provided at the top with a coupling member consisting of a fork 5 and key 6 and having a collar 6 at its hottom end upo'n which rests aplate 7. The contractible core may consist of four hollow metal segments 8, 9,- 10, 11 whose bottom ends rest upon the plate 7 and which, when they are assembled around the central shaft4may lee-driven apart by a cross-shaped member 12 inserted between the segments at their top end as shown in Figs. 2 and 3. The arms of the cross 12 are wedge-shaped, the narrow". edges of the wedges being at the bottomlof the cross. Attached to the circumference-o the cross isa ring 13 whose internal'diamete is smaller at the top than at the "bottontsf that a shoulder 14 is produced which la-aim ioo hollow segments 8, 9,- 10, 11 of the pore; as

shaped wedge similar to 12 is placed on the plate 7 with its sharp or narrower edges directed. upwardly so that when a flanged collar 18 is urged downwards against the to cross 12 by a wedge 19, that passes throug slots in thecollar 18 and the vertical shaft 4, the four hollow segments 8, 9, 10, 11 are driven apart until their top edges engage with the widened internal part of the ring 13 while their bottom external edges are pressed against the internal ring 20. This rin may consist of four parts 21, 22, 23, 24 which are held together by any suitable means on the plate 7, but are detachable from the latter so that the sections 23, 24 may, after. the core consisting of the parts 8, 9, 10, 11 is removed, be drawn inwards whereupon the parts 21, 22 may also be drawn inwards and removed from the end of the concrete pipe formed as hereinafter more fully described. The bottom end 25 of the vertical shaft 4 is journalled in a footbearing 26 which may be raised and lowered a slight distance by any suitable means in a supporting plate 27. When the finished ipe is to be removed the foot-bearing 26 is ow ered so that the end of the shaft 25 may be moved past the collar 28 in the supporting plate 27 as hereinafter more fully described.

Arranged above the top end of the revoluble core are rails 29 which support the rolls 30 of a trolley 31. This trolley, as seen in Fig. 1, is a U-shaped member with a wedge shaped yoke 32. The yoke has a slot 33 so as to form two lateral fingers or checks adapted to enter beneath the bottom edge 34 of the head 5 and to support this head with the shaft 4 and the arts surrounding it. After the trolley 31 as been brought into position to support the head 34 the wedge 6 is removed and the core with the pipe cast as hereinafter more fully described may then be rolled away on the rails 29. Peripheral bars 36, 37, .38, 39 are placed between the hollow se ments 8, 9, 10, 11 as shown in Fig. 3 ,an the afore-described cross-shaped wedge 12 is tightened down so as to firmly hold the segments 8, 9, 10, 11 as described above. Then a reticulated member such as a length of wire-netting is placed round the core as indicatedin Figs. 1, 2 and 3. A gap is maintained between the wire netting 35 and the core by means of spacing members 40 which may be attached either to the core 8, 9, 10, 11 or to the wire netting 35. The core is now rotated by means of the driving shafts 1 and 2 and concrete is squirted or flung against the rotating core by means of a concrete flinger which will now be more fullypdescribed. g i.

The concrete fiinger is shown mounted on brackets 41, 42 which in turn are attached to a vertical reciprocating rod 3 guided in guide members 43, 44, 45. Attached to the bracket 42 is another bracket 46 at whose bottom end is journalled a revolving member comprising blades 47 which have concave surfaces as shown by the section of a. blade illustrated in Fig. 4. The blades are rotated past the nozzle 48 of a cylinder 49 in which is shown a piston 50. Said piston is pushed downward at a constant speed by a threaded piston rod 51 so as to squirt out the soft concrete 52 in the cylinder 49. As the concrete is squirted out it is'struck by the blades 47 and. flung against the rotating core covered with the wire netting 35 that constitutes a concrete holder. As the core rotates the concrete flinger is raised and lowered so as to cover all parts of the rotating core with concrete. The piston rod 51 is driven to and fro by a nut 53 rotated by a motor 54 through bevel wheels 55, 56. When the piston is withdrawn from the cylinder 49, the latter can be re-charged with soft concrete through a hopper 57. The surface of the pipe is made smooth by a wire 58 and ascraper 59 which cut away all the concrete that extends beyond acertain distance from the core.

After a pipe has been cast in the manner described the core is uncoupled from the vertical shaft 2, the foot bearin 26 is lowered and then the core with the pipe is rolled and ry. The cross-shaped wedge 12 is then removed so that the hollow segments 8, 9, 10, 11 can be pulled inward and removed. The sections 23, 24 of the ring 20 are then pulled inwards and subsequently the sections 21, 22, of the ring are also removed. A pipe with an embedded cylindrical wire network and an end or sleeve of enlarged diameter, as shown in Fig. 7, is thus produced, the sleeve of enlarged diameter having an internal ring-shaped groove 60. The small end 61 of another ipe can then be inserted into the enlarge end and packing material 62 may be stuffed in. The packing material is prevented from bein dislodged through slight movements of t e ends of the pipes by the ring-shaped internal groove 60.

The spacing members 40 may be small protuberanees on the hollow metal segments 8, 9, 10, 11 which are integral with the se ments or they may be temporarily loosely attached to the segments so as to remain in the internal wall of the pipe when the core is removed, or they may consist of small blocks of concrete or the like attached to the wire netting and remaining in the tube when it is finished.

The rotaryblades 47 of the concrete flin er may be substituted by a nozzle 63, Fig. 8, that directs a jet of air past the concrete ejecti'ng nozzle 48 and a furtler nozzle 64 that dito adplace where the pipe is allowed to set inforceinent, of a verticallymovable concrete fi1nger-dev1ce comprising'a cylindrical com rects the jet of concrete against the revolving core.

I claim a .1. In an apparatus for producing concrete pipes, the combination with a vertically dis v posed revoluble core'adaptedto support arecrete container, a nozzle at one end of the container, a piston movable withln said container for forcing soft concrete through said.

nozzle, and revolving blades disposed below said vnozzle for flinging the concretedriventherethrough against the concrete reinforcement revoluble with said core;

2. -In an apparatus for PIOdllC-lllg concrete pipes, the combination of a vertically disposed revoluble core adapted to support a reticulated concrete reinforcement, a vertically movable supporting frame, means for guiding said frame, a concrete flinger-device mounted on said frame and comprising a cylindrical concrete container, a nozzle at one end of the container, a piston movable within said container for driving soft concrete through said nozzle, means fior moving said piston in alternate directions at a constant speed, and revoluble blades arranged in proximit to said nozzle for flinging concrete force forcement revolving with said core.

3. In an apparatus for producing concrete pipes, the combination with a cylindricalvertically disposed revoluble core adapted to carry a concrete reinforcement member, of a therethrough. against the. re1n.

vertically movable supporting frame, guidlng means therefor, avconcrete flinger-device mounted on said frame and comprising a cylindrical concrete container, a nozzle at one end of the container, a piston movable within said container at a constant speed for driving soft concrete through said nozzle, and a blade-carrying rotary member disposed in proximity to said nozzle for catching and flinging the concrete forced therethroughagainst the reinforcement member carried by said core.

4. In an apparatus of the character de scribed, the combination with a vertically v disposed revoluble core adapted to carr a said support subjacent' the nozzle of said concrete container for catching and flinging the concrete forced therethrough against the reinforcement member as the latter is rotated-with said core.

In testimony whereof I have aflix'ed my signature 7 v 'ALPHONS HORTEN. 

